Vacuum tray for vacuum packing

ABSTRACT

The present invention relates to a vacuum tray which is inserted into a vacuum bag and makes it possible for the vacuum bag to be easily vacuumized even if the vacuum bag has no embossments. Particularly, the vacuum tray is characterize in that an airflow defining part ( 200 ), which can be thermally bonded to a vacuum bag, is provided at a front end of the vacuum tray so that air in the vacuum bag is easily discharged to the outside through an opening of the vacuum bag. Furthermore, the present invention is characterized in that a cover ( 400 ) may be coupled to the vacuum tray, thus preventing appearance of a food from being deformed.

TECHNICAL FIELD

The present invention relates to a vacuum tray for vacuum packing which is inserted into a vacuum bag and makes it possible for the vacuum bag to be easily vacuumized even if the vacuum bag has no embossments.

BACKGROUND ART

Generally, vacuum bags are a kind of bag which contains therein objects such as food and is vacuumized by a vacuum packing machine before an opening thereof is sealed, thus keeping the objects in a vacuum state. Of these vacuum bags, there are vacuum bags which have no embossments. However, because vacuum bags having embossments are easily vacuumized, they have typically been used.

As a representative example of such vacuum bags, there is a vacuum bag having embossments which was proposed in Korean Laid-open Publication No. 92-0700998. As shown in FIG. 1, the conventional vacuum bag 21 has embossments 25 which are formed on an inner surface of the vacuum bag 21. The embossments 25 form air discharge passages during a vacuum packing process. The vacuum bag 21 is vacuumized and thermally sealed by a vacuum packing machine 20, as shown in FIG. 2.

In detail, the conventional vacuum packing machine 20 includes a base 32, a hood 33, a vacuum chamber 34 which is provided between them, a vacuum pump (not shown) which vacuumizes the vacuum chamber 34, and a thermal sealing means 50 which thermally seals the opening of a vacuum bag 21. To vacuum-pack the vacuum bag 21 using the vacuum packing machine 20, after an object, such as food, to be packed is loaded into the vacuum bag 21, an opening of the vacuum bag 21 is placed in the vacuum chamber 34. The hood 33 thereafter moves downwards onto the base 32 so that the vacuum bag and the vacuum chamber are sealed together. Thereafter, when a switch is tuned on, the vacuum pump is operated. Then, the vacuum chamber 34 and vacuum bag 21 are vacuumized by the vacuum pump. Thereafter, the opening of the vacuum bag 21 is thermally sealed by the thermal sealing means 50.

Here, because, as shown in FIG. 1, the embossments 25 are formed on one inner surface of the vacuum bag 21, air is smoothly discharged from the interior of the vacuum bag 21 to the outside.

In the meantime, there are vacuum bags which are not embossed. Such a vacuum bag is vacuumized and thermally sealed by a nozzle-type vacuum packing machine having a complex structure, or it is used along with a separate nozzle which is thermally sealed with a vacuum bag together in a state of being inserted into the vacuum bag. The technique of such a nozzle, which is thermally sealed with a vacuum bag together in a state of being inserted into the vacuum bag, was proposed in Korean Utility Model Registration Nos. 315704 and 323806.

DISCLOSURE OF INVENTION

Technical Problem

In conventional vacuum bags having embossments, because embossments must be directly formed on the vacuum bag, the manufacturing process of the vacuum bag is very complicated. Besides, because the vacuum bag is made from material such as polyethylene or polypropylene and is very thin so that the vacuum bag can be thermally sealed, the vacuum bag is very feeble and tears easily. Therefore, it is very difficult to directly form embossments on the vacuum bag. As a result, this increases the price of the vacuum bag. Furthermore, in the process of manufacturing the vacuum bag having embossments, embossments may be damaged by a pair of heated rollers, thus causing defective products.

As well, in conventional nozzle-type vacuum packing machines, a nozzle must be inserted into a vacuum bag during a vacuumizing process; subsequently, it must be removed from the vacuum bag during a thermal sealing process that follows the vacuumizing process. As such, to achieve the purpose of controlling the position of the nozzle during the vacuumizing and thermal sealing processes, the structure is very complicated.

In addition, in the case of a nozzle which is thermally sealed with a vacuum bag together in a state of being inserted in the vacuum bag, the process of manufacturing the nozzle is difficult due to its complex shape. Furthermore, because the nozzle is slender and long, there is a problem of an air trap occurring at the opposite end from the position of the nozzle opening.

As well, in conventional arts, when it is desired to vacuum-pack food using a vacuum bag, because many food items are separately put into the vacuum bag, the process of putting the food into the vacuum bag is very inconvenient to a user. Particularly, if the opening of the vacuum bag becomes stained with water from food, there is difficulty conducting a thermal sealing process. Furthermore, a process of removing the vacuum-packed food from the vacuum bag is inconvenient. In addition, if the vacuum-packed food is frozen, the food undesirably sticks to the vacuum bag due to the frozen juice, thus the food may not be easily separated from the vacuum bag when removed.

Moreover, in conventional vacuum packing methods, because food moves freely in a vacuum bag, its appearance and its cleanliness both suffer. If two kinds of food are put in a vacuum bag together, there is a problem in that they mix with each other.

Technical Solution

Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a vacuum tray for vacuum packing which makes it possible to put food into a vacuum bag in a single process, and of which a front part has a structure capable of easily discharging air in the vacuum bag to the outside through an opening of the vacuum bag, thus smoothly vacuum-packing the vacuum bag.

Another object of the present invention is to provide a vacuum tray for vacuum packing in which an airflow defining part is coupled to a front end of an upper plate and is thermally bonded to a vacuum bag, thus making the vacuum packing process easier.

A further object of the present invention is to provide a vacuum tray for vacuum packing in which a juice receiving recess having a simple structure is provided in a bottom plate, so that, because food juice can collect in one place, the food is sanitarily stored, and, because the juice is naturally separated from the solid portion of the food during the vacuum packing process, the vacuum packing process becomes very convenient.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a conventional vacuum bag having embossments;

FIG. 2 illustrates a conventional vacuum packing machine;

FIG. 3 shows a vacuum tray according to a first embodiment of the present invention;

FIG. 4 shows the vacuum tray according to the first embodiment of the present invention;

FIG. 5 shows a vacuum tray according to a second embodiment of the present invention;

FIG. 6 shows another vacuum tray according to the second embodiment of the present invention;

FIG. 7 shows a vacuum tray according to a third embodiment of the present invention;

FIG. 8 shows another vacuum tray according to the third embodiment of the present invention;

FIG. 9 shows a vacuum tray according to a fourth embodiment of the present invention;

FIG. 10 shows a vacuum tray according to a fifth embodiment of the present invention;

FIG. 11 shows a vacuum packing process using the vacuum tray according to the present invention;

FIG. 12 shows a vacuum packing process using the vacuum tray according to the present invention;

FIG. 13 shows a vacuum tray according to a sixth embodiment of the present invention;

FIG. 14 shows the vacuum tray according to the sixth embodiment of the present invention; and

FIG. 15 shows a vacuum packing process using the vacuum tray according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

FIRST EMBODIMENT

FIG. 3 shows a vacuum tray for vacuum packing according to a preferred embodiment of the present invention. FIG. 4 is a view showing the vacuum tray which is inserted along with an object into a vacuum bag. As shown in FIG. 3, the vacuum tray for vacuum packing according to the present invention includes a bottom plate 100 which is inserted into a vacuum bag to support thereon an object to be packed; and an inclined plate 140 which is integrally coupled to a front end of the bottom plate 100 and is inclined at a predetermined angle with respect to the bottom plate 100. Embossments such as protrusions 181 and 182 are formed on and under both the bottom plate 100 and the inclined plate 140.

Such embossments may be formed only on inner surfaces of both the bottom plate 100 and the inclined plate 140, like the protrusions 181 formed on their inner surfaces. Alternatively, the embossments may be formed only on their outer surfaces, like the protrusions 182 formed on their outer surfaces. However, it is preferable that the embossments be formed at least on their outer surfaces. The reason is that, because foods are placed on the inner surface of the bottom plate 100, the embossments formed on their outer surfaces can more reliably provide airflow passages while vacuumizing the vacuum bag.

Furthermore, because the inclined plate 140 is inclined with respect to the bottom plate 100 at a predetermined angle, the inclined plate 140 serves to widen the opening of the vacuum bag when the vacuum tray is inserted into the vacuum bag.

A plurality of air passage holes 162, which serve as paths to discharge air to the outside while vacuumizing the vacuum bag, is formed through the inclined plate 140.

The vacuum tray further includes an upper plate 160 which has embossments and is integrally coupled to a front end of the inclined plate 140. It is preferred that the upper plate 160 be parallel to the bottom plate 100.

As such, the manufacturing process of the vacuum tray, which has embossments and includes the bottom plate 100, the inclined plate 140 and the upper plate 160, is very simple and, as well, the defective proportion is low. In addition, it is easily adapted for mass production using an injection molding process or a press machine.

The vacuum tray having embossments makes it easy to vacuum-pack foods and is sanitary. Furthermore, because the vacuum tray of the present invention makes it possible to use a low-priced vacuum bag 190 such as a typical plastic film bag, which does not have embossments, total expenses incurred for vacuum packing are reduced.

Moreover, because the vacuum tray is relatively broad, the present invention prevents partial air trap from occurring during a vacuum packing process, unlike conventional arts using a slender and long vacuum nozzle.

The vacuum tray for vacuum packing according to the present invention may be made of plastic or ABS resin. Alternatively, the vacuum tray may be made of environentally-friendly material such as pulp.

To vacuum-pack the vacuum bag 190 using the vacuum tray of the present invention, the vacuum tray of the present invention supports thereon foods to be packed and is inserted into the vacuum bag 190, as shown in FIG. 4. Thereafter, the vacuum bag 190 is vacuumized and thermal-sealed by a vacuum packing machine such as that shown in FIG. 2. Of course, the vacuum tray may be used in a vacuum packing process using a nozzle-type vacuum packing machine as well as in the vacuum packing process using the chamber-type vacuum packing machine of FIG. 2.

SECOND EMBODIMENT

FIG. 5 shows an airflow defining part integrated with a vacuum tray such as that shown in FIG. 3.

Referring to FIG. 5, it is understood that a first airflow defining part 200 is coupled to a front end of an upperplate 160 of the vacuum tray such as that shown in FIG.3. Preferably, the first airflow defining part 200 is integrated with the vacuum tray through an injection molding process. To reduce the material cost and to allow it to be cut easily, the first airflow defining part 200 is tinier than the upper plate 160.

The first airflow defining part 200 must be made of material which can be thermally bonded to a vacuum bag. The reason is that, when an opening of the vacuum bag is thermal-sealed by a thermal sealing means 50, the first airflow defining part 200 must be thermally bonded to the vacuum bag together.

FIG. 6 shows a vacuum tray which is not embossed in regions other than a first airflow part 200, unlike the vacuum tray of FIG. 5. In the case that the airflow defining part 200 is provided, even if a part of the vacuum tray other than the airflow defining part 200 is not embossed, it is possible to easily vacuum-pack a vacuum bag.

Because the airflow defining part 200 must be made of material which can be thermally bonded to a vacuum bag, in the case that the vacuum tray integrally including the airflow defining part 200 is manufactured through an injection molding process, the entire vacuum tray is made of material which can be thermally bonded to the vacuum bag. PE (polyethylene), HDPE (high density polyethylene) and PP (polypropylene) are representative examples of such material.

FIG. 11 is a sectional view showing a vacuum packing process using the vacuum tray having the first airflow defining part 200 according to this embodiment.

To vacuum-pack a vacuum bag 190, the vacuum tray, which supports thereon an object to be packed, is inserted into the vacuum bag 190. Thereafter, as shown in FIG. 11, a user places an opening of the vacuum bag 190 between a base 32 and a hood 33 of a vacuum packing machine and starts a vacuum packing process.

After the process of vacuumizing the vacuum bag 190 is completed, a thermal sealing means 50 is operated to thermally seal the opening of the vacuum bag 190, thus completing the vacuum packing process. Here, because the first airflow defining part 200 is placed near the opening of the vacuum bag, the airflow defining part 200 is also heated by the thermal sealing means 50. Thus, the vacuum bag 190 is thermally bonded to both surfaces of the airflow defining part 200.

Thereafter, the user opens the hood 33 and takes out the vacuum bag 190 containing the object from the vacuum packing machine to store it. When it is desired to remove the object from the vacuum bag 190, the bonded part is cut off from the vacuum bag 190 by a tool, such as scissors or a knife, and the object is pulled out from the vacuum bag 190.

Because the first airflow defining part 200 is made of PE, HDPE or PP and is thin, it can be easily cut.

When it is desired to store another object, the vacuum tray according to this embodiment can be used again in the same method. As the vacuum tray is repeatedly used, the length of the airflow defining part 200 becomes short. When the airflow defining part 200 becomes too short to cut anymore, the vacuum tray according to this embodiment has the same shape as the vacuum tray of FIG. 3. Therefore, in this case, the vacuum tray according to this embodiment can be used in the same manner as that described for the vacuum tray of FIG. 3.

THIRD EMBODIMENT

FIG. 7 shows a coupling of a second airflow defining part 330 to a vacuum tray such as that shown in FIG. 3. A vinyl sheet having embossments is used as the second airflow defining part 330. Furthermore, a piece cut from a typical vinyl bag having embossments maybe used.

The second airflow defining part 33 is coupled to an upper plate 160 of the vacuum tray by a holder 310. The holder 310 includes a coupling part 311, a support plate 312 and a clamp 313. The coupling part 311 serves to couple the holder 310 to the upper plate 160 of the vacuum tray. As shown in FIG. 12, the coupling part 311 has a U-shaped cross-section. The upper plate 160 is inserted into a hole of the coupling part 311 having the U-shaped cross-section, so that the coupling part 311 is coupled to the upper plate 160.

The support plate 312 supports thereon the second airflow defining part 330 such as a piece of vacuum bag. The clamp 313 holds the second airflow defining part 330 placed on the support plate 312, thus fastening it to the support plate 312.

The holder 310 is not limited to that shown in FIG. 6. That is, the holder 310 can have any structure so long as it is able to hold the second airflow defining part 330 such as a piece of vacuum bag.

FIG. 8 shows a vacuum tray which is not embossed at a region other than a first airflow part 200, unlike the vacuum tray of FIG. 7. In the case that the airflow defining part 330 is provided, even if parts of the vacuum tray other than the airflow defining part 200 are not embossed, it is possible to easily vacuum-pack a vacuum bag.

FIG. 12 is a sectional view showing a vacuum packing process using the vacuum tray having the second airflow defining part 330.

To vacuum-pack a vacuum bag 190, the vacuum tray, which supports thereon an object to be packed, is inserted into the vacuum bag 190. Thereafter, as shown in FIG. 12, a user places an opening of the vacuum bag 190 between a base 32 and a hood 33 of a vacuum packing machine and arts a vacuum packing process.

After the process of vacuumizing the vacuum bag 190 is completed, a thermal sealing means 50 is operated to thermally seal the opening of the vacuum bag, thus completing the vacuum packing process. Here, because the second airflow defining part 330 is placed near the opening of the vacuum bag 190, the airflow defining part 330 is also heated by the thermal sealing means 50. Thus, the vacuum bag 190 is thermally bonded to both surfaces of the airflow defining part 330.

Thereafter, the user opens the hood 33 and takes out the vacuum bag 190 containing the object from the vacuum packing machine to store the vacuum bag 190 containing the object. When it is desired to take the object out of the vacuum bag 190, the bonded part is cut off of the vacuum bag 190 by a tool, such as scissors or a knife, and the object is pulled out of the vacuum bag 190.

Because the second airflow defining part 330 having embossments is made of a piece of vacuum bag, it can be easily cut.

When it is desired to keep another object, the vacuum tray can be used again in the same method. As the vacuum tray is used repeatedly, the length of the airflow defining part 330 becomes short. When the airflow defining part 330 becomes too short to cut anymore, the airflow defining part 330 is replaced with a new one. In other words, a remaining vacuum bag placed on the support plate 312 is replaced with a new airflow defining part.

FOURTH EMBODIMENT

As shown in FIG. 9, a vacuum tray according to this embodiment includes a bottom plate 100 and side plates 110, 120, 130 and 140. A juice receiving recess 150 is provided at a predetermined position on the bottom plate.

The bottom plate 100 can be adjusted in length. Thus, the size of the vacuum tray is adjusted according to the amount of food. To achieve the purpose of adjusting the length of the bottom plate 100, as shown in FIG. 9, the bottom plate 100 of the vacuum tray according to this embodiment consists of an upper bottom plate 101 and a lower bottom plate 102. The upper bottom plate 101 has a structure capable of sliding on the lower bottom plate 102. Preferably, as shown in FIG. 9, the lower bottom plate 102 has at a front end thereof a flange 171 which is bent inwards, while the upper bottom plate 101 has at a rear end thereof a flange 170 which is bent outwards. The flanges 170 and 171 prevent the food juice from leaking from the vacuum tray and prevent the upper bottom plate 101 from being separated from the lower bottom plate 102.

The front side plate 140 has a plurality of air passage holes 162 which is formed through the front side plate 140. An upper plate 160 and a lower guide plate 161 extend outwards from an outer surface of the front side plate 140 above and below the air passage holes 162, respectively, thus serving to widen an opening of a vacuum bag.

Furthermore, a first airflow defining part 200 is integrally coupled to a front end of the upper plate 160. Preferably, the first airflow defining part 200 is integrated with the upper plate 160 through an injection molding process. To reduce the material cost and to allow it to be cut easily, the first airflow defining part 200 is thinner than the upper plate 160.

The first airflow defining part 160 must be made of material which can be thermally bonded to a vacuum bag.

In this embodiment, both the structure of the first airflow defining part 200 coupled to the upper plate 160 and a vacuum packing process including a thermally bonding process of the airflow defining part are the same as those described for the second embodiment. However, the vacuum tray according to the fourth embodiment has the juice receiving recess 150 to separately receive the food juice, unlike the second embodiment.

In the fourth embodiment, although it has been explained that the first airflow defining part 200 is coupled only to the upper plate 160, the first airflow defining part 200 may be coupled to the upper plate 160 or, alternatively, it may be coupled to the lower guide plate 161.

FIFTH EMBODIMENT

FIG. 10 shows a vacuum tray, such as that shown in FIG. 9, but one to which a second airflow defining part 330 is coupled in place of the first airflow defining part 200.

In this embodiment, the second airflow defining part 330 is coupled to the upper plate 160 by a holder 310. The holder 310 includes a coupling part 311, a support plate 312 and a clamp 313. The coupling part 311 serves to couple the holder 310 to the upper plate 160 of the vacuum tray. As shown in FIG. 12, the coupling part 311 has a U-shaped cross-section. The upper plate 160 is inserted into a hole of the coupling part 311 having the U-shaped cross-section, so that the coupling part 311 is coupled to the upper plate 160.

The support plate 312 supports thereon the second airflow defining part 330 such as a piece of vacuum bag. The clamp 313 holds the second airflow defining part 330 placed on the support plate 312, thus fastening it to the support plate 312.

The holder 310 is not limited to that shown in FIG. 7. That is, the holder 310 can have any structure so long as it is able to hold the second airflow defining part 330 such as a piece of vacuum bag. Furthermore, the holder 310 may be coupled not only to the upper plate 160 but also to a lowerguide plate 161.

The vacuum packing process using the vacuum tray of this embodiment is the same as that described for the third embodiment. However, the fifth embodiment has a juice receiving recess 150 to separately receive the juice of food, unlike the third embodiment.

SIXTH EMBODIMENT

FIGS. 13 through 15 show a vacuum tray, according to a sixth embodiment of the present invention.

The vacuum tray according this embodiment is characterized in that an airflow defining part 210, which is thermally sealed with a vacuum bag together, is provided in front of a bottom plate 100 and a juice receiving recess 150 is defined along an edge of the bottom plate 100.

FIG. 13 is a perspective view of the vacuum tray of the present invention. FIG. 14 is a side sectional view of the vacuum tray with a cover.

The bottom plate 100 of the vacuum tray of the present invention supports thereon an object to be packed. The juice receiving recess 150 is defined along the edge of the bottom plate 100. A guide part 151, an outer edge of which is rounded outward, is provided along the outline of the juice receiving recess 150.

Furthermore, a front side plate 140 is integrally coupled to a front end of the bottom plate 100. An upper plate 160 is integrally provided at an upper end of the front side plate 140. In the case in which the front side plate 140 and the upper plate 160 are rounded and integrated into a single body, it may be unnecessary to provide the front side plate 140 and the upper plate 160 separately. A reinforcing rib 141 may be provided at each of opposite sides of the front side plate 140, as shown in FIG. 13. In the case that the reinforcing rib 141 is provided to reinforce the strength of the front side plate 140, even if a heavy object is placed on the bottom plate 100, the front side plate 140 is not easily broken.

The airflow defining part 210 having embossments is coupled to the front end of the upper plate 160. The airflow defining part 210 may be directly coupled to the upper end of the front side plate 140 without the upper plate 160.

As shown in FIGS. 13 and 14, the vacuum tray having the above-mentioned construction maybe provided with a cover 400. FIG. 14 shows a coupling of the cover to the vacuum tray. The guide part 151, which is rounded outwards, serves as a coupling protrusion, that is, it is hooked to a coupling groove 410 provided on a lower end of the cover 400, so that the cover 400 is fastened to the vacuum tray. Preferably, an air passage hole 420 is formed through a front wall of the cover 400 for ventilation.

The cover 400 can be coupled to the vacuum tray regardless of a coupling structure. Furthermore, the cover 400 may be merely placed on the vacuum tray without a special coupling means.

In the vacuum tray of the present invention having the above-mentioned construction, it is preferred that the airflow defining part 200 be integrated with the bottom plate 100 through a vacuum molding process. The reason is that the vacuum molding process can markedly increase productivity compared with an injection molding process.

Furthermore, the vacuum tray of the present invention must be made of material which can be used for thermally bonding. The reason is that, when an opening of a vacuum bag 190 is thermally sealed by a thermal sealing means 50, the airflow defining part 210 must also be thermally bonded to the vacuum bag 190. Therefore, it is preferred that the vacuum tray be made of PE (polyethylene), HDPE (high density polyethylene) or PP (polypropylene).

In addition, the airflow defining part 210 is thinner than the upper plate 160 to reduce the material cost and to allow it to be cut easily.

The usage of the vacuum tray according to the sixth embodiment is the same as that described for the second embodiment. However, unlike the vacuum tray of the second embodiment, the vacuum tray according to the sixth embodiment may be provided with a cover, and has a juice receiving recess.

INDUSTRIAL APPLICABILITY

The brief description of the effect of the vacuum tray of the present invention is as follows.

First, the structure of the present invention including both a bottom plate and an inclined plate is simpler than conventional arts having nozzles for vacuum packing. Furthermore, the bottom plate and inclined plate serve to widen an opening of a vacuum bag and, thus, they help execute a smooth vacuum packing process. Therefore, the present invention makes it possible for a vacuum bag to be easily vacuumized even if the vacuum bag has no embossments.

Second, in the present invention, an airflow defining part having embossments is coupled to a front end of the vacuum tray. Accordingly, compared with conventional arts in which a thin and feeble vacuum bag is directly embossed, the process of manufacturing the present invention is markedly simple. Furthermore, because the vacuum tray of the present invention is able to use a low-priced vacuum bag such as a typical plastic film bag, total expenses incurred for vacuum packing are reduced.

Third, because the vacuum tray of the present invention has a relatively broad plate shape, partial air trap is prevented from occurring during a vacuum packing process even if a typical vacuum bag having no embossments is used. Therefore, the vacuum packing process becomes easy.

Fourth, the vacuum tray of the present invention has an air passage hole and an upper plate so that air in a vacuum bag may easily be discharged to the atmosphere.

Fifth, the airflow defining part is thin and is integrated with the vacuum tray through an injection molding process, so that the manufacturing costs of the vacuum tray is reduced and the vacuum tray forming process is markedly simplified.

Sixth, in the case that a vinyl sheet having embossments is used as an airflow defining part, replacement of the airflow defining part is easy. Furthermore, because a previously used vacuum bag having embossments can be reused, it is very economical for a user.

Seventh, because the airflow defining part and an opening of a vacuum bag are thermally sealed together, a vacuum packing process is simple.

Eighth, a juice receiving recess is provided at a predetermined position of the bottom plate. Therefore, because the food juice can be collected in one place during a vacuum packing process, the food is sanitarily stored. As well, because the juice is naturally separated from the food, the vacuum packing process is made convenient. A juice receiving recess may be provided along an outer edge of a bottom plate of a vacuum tray. In this case, the vacuum tray has a small size despite having the juice receiving recess.

Ninth, in the case that a reinforcing rib is provided on a front side plate, because the strength of a vacuum tray increases, the vacuum tray is not easily broken.

Tenth, in the case that a guide part serving as a coupling protrusion is provided along the outer edge of the bottom plate, a cover may be hooked to the guide part of the vacuum tray. 

1. A vacuum tray for vacuum packing, comprising: a bottom plate inserted into a vacuum bag to support thereon an object to be packed; a front side plate integrally coupled to a front end of the bottom plate; and an upper plate integrally coupled to a front end of the front side plate.
 2. A vacuum tray for vacuum packing, comprising: a bottom plate inserted into a vacuum bag to support thereon an object to be packed; a front side plate integrally coupled to a front end of the bottom plate; and an airflow defining part coupled to a front end of the front side plate, wherein the airflow defining part is thermally bonded to the vacuum bag.
 3. The vacuum tray for vacuum packing according to claim 1, further comprising: an airflow defining part coupled to a front end of the front side plate, wherein the airflow defining part is thermally bonded to the vacuum bag.
 4. The vacuum tray for vacuum packing according to claim 2, wherein the airflow defining part comprises a part of the upper plate on which an embossment is formed.
 5. The vacuum tray for vacuum packing according to claim 2, further comprising: a holder coupled to the front side plate, and wherein the airflow defining part comprises a vacuum bag having embossments and being held by the holder.
 6. The vacuum tray for vacuum packing according to claim 4, further comprising: a juice receiving recess defined along an edge of the bottom plate.
 7. The vacuum tray for vacuum packing according to claim 4, wherein the front side plate of the bottom plate is provided with a reinforcing rib.
 8. A vacuum tray for vacuum packing, comprising: a bottom plate inserted into a vacuum bag to support thereon an object to be packed; a side plate; and a cover, wherein the cover is provided with an air passage hole.
 9. The vacuum tray for vacuum packing according to claim 3, wherein the airflow defining part comprises a part of the upper plate on which an embossment is formed.
 10. The vacuum tray for vacuum packing according to claim 3, further comprising: a holder coupled to the front side plate, and wherein the airflow defining part comprises a vacuum bag having embossments and being held by the holder. 